Core for manufacturing pneumatic tires.



J. K. WILLIAMS. GORE FOR MANUFACTURING PNEUMATIC TIRES. APPLICATION PILED OUT. 26, 1908.

Patented Feb. 8, 1910.

UNITED STATES PATENT OFF JOHN xl WILLIAMS, or AKRON, OHIO, ASSIGNOR or ONE-mm 'roi z'rnnlwrurnirs rouNnnY AND MACHINE coMrANY, A CORPORATION on 01110. v

CORE FOR MANUFACTURING PNEUMATIC TIRES.

To all who'ni a m concerri:

Beit known that I, JoHN K Wnmnis,

a citizen of the United States, residing at Akron, 111 the county of Summit and .State of Ohio, have invented new and useful Improvements in Cores for Manufacturing- Pneumatic Tires, of which the following is a specification.

This inventi or mandrels for manufacturing pneumatic tires of the double-tube type having inextensible bands or 'selvages.

In constructing the outer tubes or wearresisting casings of pneumatic tires, an annularl -for med core or mandrel is employed on WhlCh the successive layers of rubber and fabric .or rubber saturated fabric are built up and during the buildingprocess the edges :orselvages of the-tire adapted to engage the retaining means of the wheel rim are so made or. formed as to render them substantially inextensible. In consequence of the fact that these edges cannot be stretched and vthat the tire is annularly-formed with the circumferential opening therein inwardly, it becomes necessary to construct the core 1n such-a manner that it .can be collapsed or withdrawn from the interiorof the commental portions adapted to be united to form.

pleted tire through the opening existing between its rim-engaging edges.

The object of thls invention therefore is, broadly speaking, to construct a core upon.

which the tire may be built, which may be easily and successfully removedfrom' the interior of the tire at any time after its completion.

. A further; object of this invention 1s. to construct the tire with a plurality 01? segan annular core and provided with means for fixedly securing the several members to each other without-thenecessity' of employing means independent thereof for maintaimn struction, combination and arrangement of' parts constituting the invention to be'herem them in cooperati relation.

A still further ob ect is to construct a core.

Specification of Letters Patent.

on relates to collapsible cores with this invention, ready for use. 2 is the tire.

now in use, strong, durathe accompanying drawings which form a part hereof wherein is shown the preferred embodiment of the invention, but it is to be understood that changes, variations and modlfications can be resorted to -'which come within the scope of the claims hereunto appended.

In th drawings, in which similar reference numerals indicate like parts in the different figures: Figure 1 is a'view in sideelevation of a core constructed in. accordance a section of Fig. 1 on line X thereof. g. 3 1s a view similar to Fig. 1 with the members of the core separated. Fi 4 is a sectional view of Fig. 1 on line Y; and, Fig. -5 is a perspective view of one of the segments of It is believed that the description of the detailed statement of the manneraof constructing the same. ".j:

In" making a core such as is shown inthe drawin s, I refer to make it of cast metal, althoug I 0 not confine myself to this material and in producing the. same I first I Patented Feb." 3,1910. Application filed October 26, 1908. Serial NO. 459,572. I 7

after specifically described'and device will be better understood by giving a' i form two annular similar members 1 and 2 7 having the exterior surfaces thereof of the shape which it is desired to impart tothe interior of the tire casing, having ably rounded portions 3 and inwar'ly-ex tending flanges 4. In order to reduce weight, the members 1 and 2 are provided with circumferentially-extending recesses 5 refer-1 in their rounded portions and with similar recesses 6 in the flanged portions thereof, said recesses bein ferentially-extending ridgesoredges 7 and .8, the recesses in the roundedportions being separated from the recesses in the flanged portion by. dividing ridges 9, the faces of he ridges 7,8 and 9 being in'the surrounded 'by circumsame planeso that when the two members of the device are placed in cooperatingrelation with therec'es'sedfaces thereof in contact, each ridge 7,8 or 9 of one member W111 register with a corresponding e ofthe other member .and'the recesses 5' an 6 of one member will re 'ster with a similar'recess in the other. e two members when n abuttingi'relation 'are-,connected by p ns-10 ;ex tendi ng through the flanged portions 4 roundedgaportions'ofi-the same so t, at the membersare firmly united to each other.

'Thetwomembers. are. then placed in a suitablem'a'chi'he, such as a lathe, and the outer surfaces 'thereiif'turned to the desired size and configuration which itis intended to impart to the tire casing to be built thereon. When .the smoothing and shaping of the exterior surfaces of the now assembled device are completed, a number of oblique cuts 12, 13 and 14 are then made through the member 1 and similarcuts 15 16 and-17 are made through the member Then the portion between the cuts 12.a'nd 13 of the member 1, hereinafter designated b the reference numeral 18; may be readi y removed by withdrawing it inwardly toward e center of the core, by reason of the fact that thecuts 12 and 13 form the portion 18 with wedge-shaped ends and this peculiar formation will 'permit the withdrawal of this segment inwardly. The segment of themember-2,,situated between the cuts '15 and 16, hereinafter designated by the reference numeral 19, is then removed in a similar manner and afterward the two members 18 and 19 are preferably secured together for convenience in handling, so that when it is desired to remove these two segments, time will be saved by uniting them to reduce the number. of parts necessarily manipulated by the' operator and this is done by pins 20 passing through their abutting flanged portions and by means of pins 21 'throu h their rounded portions, It will be entire y obvione of course that the device will-be as effflcient if the two members 18 and 19' are not secured together, although the preferred construction is to unite them as just described, It will'be seen that wh en these two members 18 and 19 are positioned, the end of the member 18 adjacent the cut 13 will overlap that ortion of the member. 2 which is contained iietween the cut 16 and the end of the member 1 formed by the cut 13 and at the same time the extended end of the memberilt) will lap the portion of the memher 1 between the cuts 12 and 15. It will be readily seen that when united together,- the members 18 and l9 may be withdrawninwardly toward the center of the cpre and when replaced the ends of the united embers' 18 and 19 will abut against the ends \of the members 1 and 2 and perfectly fit in the opening formed between thelr spaced ends and also that one end of the member 18 will lap the member 2 and one end of the member 19 will lap a portion of the end of the member 1. I

The construction of the ends of the severed body portion 'of the core is such that the separated ends thereof are alternately rabbeted in such a manner that if the segment comprising members 18 and 19 1s placed therein the sides thereof will interlock by reason of the fact that the alternate ends of the members 18 and 19 extend ast one another to ,oonst-itute correspon ing rabbeted portions to. cotiperatet with the severed ends of the main body portion of the mold" I v H 1 In order to secure the members 18 and 19. in proper position in the opening formed be-, tween the severed ends of the members 1 and 2, suitable holdfast devices such as screws 22 are employed, which pass through the flanged portions of both of 'themem hers 18 and 19. v

The cuts 14 and -17 through the membersl' and 2 respectively, are alternately disposed in position with respect to each other and are spaced apart in such a manner that each of the members is provided with an extended portion constituting in connection with the balance of the end of each member-a rabbeted part, so that the extended end of the portion of each of said members will overlap a complementary portion of the other member, as clearly shown in Fig. 3 and when in engaging relation with each other the members are held together through the medium of screws 23.

In using a core such as has just been described, the members are assembled as shown in Fig. 1 and the tire casing built up in any approved manner. When completed, if desired, or after construction, the members composing the core are separated in the follOWlIl manner. The screws 22 are first remove permitting the withdrawal of the united members 18 and 19 inwardly toward the s ace surrounded by the core. After this the screws 23 are removed and the two remaining portions of the core may then be withdrawn from the interior of the tire casing, without trouble, after which the members are reassembled for use in connection with the building of a second tire casing.

It will be obvious of course that instead of making the core in three pieces, as shown in the drawings, any number of segments may be employed provided that they are so made that portions of adjacent members overlap each other and also provided that the first segment removed is wed e-shaped or provided with inclined or oblique edges to permit of the withdrawal inwardly of the section contained between theoblique ends.

It will be noted in constructing thisdevice that the ends of each section thereof arev adapted to abut against one another snugly' when the parts are assembled, as shown in Fig. 1, and it will be further pointed out that in forming the two members 1 and 2, the recesses forming the hollow interiors thereof are interruptedat the ends of each segment by transverse end portions 24. shown best in Fig. 5, both for the purpose-of strengthening therespective segments, u

to laterally overlap at least one end of the remaining portion of the body, and means extending through the (iverlapping portion of said removable section and the remaining portion of the body for detachably holding said removable section in position.

2. A collapsible core for manufacturing tires comprising an annular body having as a part thereof a removable section formed with a pair of oblique shoulders at points removed from the ends thereof, the remaining portion of said body provided with a pair of oblique shoulders positioned at points removed from the ends thereof, the shoulders of said section adapted to abut against the shoulders of said body, and means extending through said section and the remaining portion of said body for detachably holding said removable section in position.

'3. A collapsible core for manufacturing tires comprising an annular body having as a art thereof aremovable section, said body of the same contour throughout and comprising a cylindrical outer portion and an inwardly-extending integral annular flange, and a transversely-extending means projecting through said removable section and the remaining .portion of the body for detachably coupling the section and the remaining portion of the body together.

4. A collapsible core for manufacturing tires comprising an annular body formedof a plurality of segments, said segments laterally overlapping at their opposing ends, and transversely-extending means proyecting through the overlapping ends of the segments for detachably-connecting the segments together.

5. A collapsible core comprising two members having the outer portion thereof formed approximately semi-circular in crosssection and with inwardly-extending flanges, said members. adapted to be permanently united to constitute a body portion, said members being provided with united segment-shaped removable portions adapted when positioned to lap adjacent portions or said members and means for securing said removable united members in position.

6. A collapsible corg comprising two annularly'formed members with flat faces arranged to be unitedto form a body portion having an outer configuration equivalent to the configuration which it is desired to impart to an article to be built thereon, segmental portions of each of said members which are in contacting relation being severed fromthe balance of said device and removable therefrom, the ends of said removable portion adapted to lap the adjacent ends of said members, said ends provided with means for securing the removable portions in position. 1

7 A collapsible core comprising two interruptedvringshaped members adapted to be sec'ureu in contacting engagement with each othenand each provided with recesses in their contactingfaces, said recesses adapt,

ed to register with each other, the point of interruption in the two members being out of alinenient with each other and a removable member corresponding in contour to said interrupted members adapted to be interposed in the space formed by the interruption of said members and to lap the adjacent portions thereof, provided with means for securing itin position.

8. A collapsible core comprising two annularly-formed severed members adapted to be secured in lateral contacting engagement with each other, theends of said mem bers at the point of severance being spaced apart and out of complete registration with each other, said contacting members each provided with recesses in their abutting faces, said recesses adapted to register with each other and a removable wedge-shaped member conforming exteriorly to the outlines of said annular members adapted to be inserted in the space intervening between the severed ends of said members, the ends of said removable member being formed to fit the ends of said annular members and lap adjacent portions thereof, said removable member provided in its lapping portions with means for securing it in position.

9. A collapsible core for manufacturing tires comprising an annular body formed of a plurality of segments, said segment-s overlapping at their opposing ends, and transthereof provided with a shoulder, the shoul 1 der at one end being oppositely-dlsposed with respect to the shoulder upon the other a amass end, the ends of one segment adapted to In testimony whereof I have hereunto set abut against the shoulder of an adjacent my hand in presence of two subscribing '10 se men;1 whereby the ends of theilsegments wltnesses. Wlell t e se 'ments are set up wi overlap 5 and removsfhle means extending th'ro'u h O WILLIAMS the overlapping ends of the segments ,5 or Witnesses:

detechably-connecting"the ends of the s'eg- C. E. HUMPHREY, ments together. GLENARA Fox. 

